fix(google-maps): fix mismatch in clusterer types

Fixes that the clusterer types seem to no longer match with the ones on npm, causing a type error.

Fixes #32696.

Author: crisbeto

src/google-maps/map-marker-clusterer/map-marker-clusterer-types.ts

@@ -22,13 +22,12 @@ export interface ClusterOptions {
 
 export interface Cluster {
   marker?: Marker;
-  readonly markers?: Marker[];
+  markers?: Marker[];
   bounds?: google.maps.LatLngBounds;
   position: google.maps.LatLng;
   count: number;
   push(marker: Marker): void;
   delete(): void;
-  new (options: ClusterOptions): Cluster;
 }
 
 export declare class MarkerClusterer extends google.maps.OverlayView {